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package com.oracle.graal.python.builtins.modules;

import static com.oracle.graal.python.util.PythonUtils.toTruffleStringUncached;

import java.util.ArrayList;
import java.util.List;

import com.oracle.graal.python.builtins.CoreFunctions;
import com.oracle.graal.python.builtins.Python3Core;
import com.oracle.graal.python.builtins.PythonBuiltins;
import com.oracle.graal.python.builtins.objects.common.EconomicMapStorage;
import com.oracle.graal.python.builtins.objects.dict.PDict;
import com.oracle.graal.python.builtins.objects.exception.OSErrorEnum;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.runtime.object.PFactory;
import com.oracle.truffle.api.dsl.NodeFactory;
import com.oracle.truffle.api.strings.TruffleString;

@CoreFunctions(defineModule = "errno")
public final class ErrnoModuleBuiltins extends PythonBuiltins {
    @Override
    protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFactories() {
        return new ArrayList<>();
    }

    @Override
    public void initialize(Python3Core core) {
        super.initialize(core);
        OSErrorEnum[] enumValues = OSErrorEnum.values();
        EconomicMapStorage storage = EconomicMapStorage.create(enumValues.length + 1);

        for (OSErrorEnum value : enumValues) {
            // if more OSError have the same number -> the last one wins
            addConstant(value.getNumber(), toTruffleStringUncached(value.name()), storage);
        }

        // publish the dictionary with mapping code -> string name
        PDict errorCode = PFactory.createDict(core.getLanguage(), storage);
        addBuiltinConstant("errorcode", errorCode);
    }

    private void addConstant(int number, TruffleString name, EconomicMapStorage storage) {
        addBuiltinConstant(name, number);
        storage.putUncached(number, name);
    }
}
